Work begins again Tuesday on the $4.2 million Morrison Bridge steel grating replacement, which means traffic changes that haven't been in place since late November, when it was shut down for the holidays.

Conway Construction of Ridgefield, Wash., is replacing the grating with a solid deck surface that will provide greater traction. Work on the south half of the lift span has been completed.

The steel grating that has been part of the bridge since 1958 is being replaced with fiber reinforced polymer panels. A similar system was installed on the Broadway Bridge in 2005. Work is expected to be completed in early spring.

Beginning Tuesday, traffic will be affected by the work on the north span of the bridge. Here are the changes that will impact traffic:

• One eastbound lane will remain open from Southwest Second Avenue to Interstate 5 north/Interstate 84 east and to Southeast Belmont Street and Martin Luther King Jr. Boulevard and Highway 99E. Access from I-5 south/I-84 west to the Morrison Bridge and downtown Portland will remain open.

• The Southwest Naito Parkway onramp to the bridge will remain closed.

• The ramp from the bridge to Southeast Water Avenue will reopen by the end of next week.

• Westbound access to the bridge from Southeast Morrison Street and Martin Luther King Jr. Blvd./Highway 99E will be closed. Alternate bridges for westbound traffic include the Hawthorne and Burnside. Access to I-5 northbound from Morrison Street and Martin Luther King Jr. Blvd./ Highway 99E remains open.

• The north sidewalk on the bridge is closed, but the path on the south side is open.

• TriMet's 15-Belmont/Northwest 23rd bus line continues to be re-routed across the Hawthorne Bridge.

• Only one drawbridge leaf can open for river traffic.

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